My Database Disappeared Every Time I Restarted Docker. Migrations Fixed That.

In Part 8 , I ripped out SQLite and switched to Postgres. The database was real now — but it still only ran on my laptop. Three terminal tabs. One for go run , one for Redis, one for Postgres. If I closed any of them, the whole thing fell over. It was time to Dockerize. The First Dockerfile: 800MB of Regret My first attempt was a single-stage Dockerfile. Copy everything, build, run: FROM golang:1.25-alpine WORKDIR /app COPY . . RUN go build -o server ./cmd/server CMD ["/app/server"] It worked. T